I too did not want any holes in our wall or ceiling so I built this storage rack to hold 4 bikes. It's just a pressure fit to hold it steady and it is very sturdy. I think it cost about 30-40 total.

http://s424.photobucket.com/albums/p...t=IMG_1312.jpg

Any advice on how to get this picture to show up in my post and not have to link to it?